Question

Dada a função calcule: f(x) = -x ao quadrado + 2x - 5
A) f(-2)
B) f(0)
C) f(3)

Answer 1

Resposta:

A) f(–2) = (– 5)

B) f(0) = (– 5)

C) f(3) = – 8

Explicação passo-a-passo:

f(x) = – x² + 2x – 5

A) f(–2) = – (–2)² + 2(–2) – 5

f(–2) = 2² + (–4) – 5

f(–2) = 2² – 4 – 5

f(–2) = 4 – 4 – 5

f(–2) = 0 – 5

f(–2) = (– 5)

B) f(0) = – (0)² + 2(0) – 5

f(0) = – 0 + 0 – 5

f(0) = (– 5)

C) f(3) = – (3)² + 2(3) – 5

f(3) = – 9 + 6 – 5

f(3) = – 3 – 5

f(3) = – 8